35x26-35x5-35=35x(26-5-1)=35x20=700利用乘法分配律的逆运算。
=35×(26-5-1)=35×20=70
35×26-35×5-35×1=35×(26-5-1)=35×20=700
(26一5一1)X35=665
=35×(26-5-1) =35×20 =700